Sequence of thrusting and syntectonic sedimentation in the eastern Sub-Atlas thrust belt (Dadès and Mgoun valleys,Morocco) |
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| Authors: | Eliseo Tesón Antonio Teixell |
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| Institution: | (1) Departament de Geologia, Universitat Autònoma de Barcelona, 08193, Bellaterra, Barcelona, Spain |
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| Abstract: | A series of balanced cross-sections across the Sub-Atlas thrust belt and the northern Ouarzazate basin are used to illustrate
the structural geometry and the timing of deformation at the southern front of the High Atlas Mountains of Morocco. The selected
area is among the best sedimentary records of mountain building of the entire orogenic system. The study of the relationships
between thrusts and synorogenic continental formations enables the unraveling of kinematic sequences and the proposal of a
relative chronology of deformation. Active thrusting in the area occurred in a rather continuous fashion from the Oligocene
to the Pliocene, punctuated by a major erosional phase imprecisely placed in late Oligocene to early Miocene times. Detrital
sedimentary facies indicate that uplift in the hinterland of the High Atlas, to the north of the Sub-Atlas belt, was taking
place already by mid Eocene times, although it might have commenced locally even earlier. Within the Sub-Atlas zone, the exposed
faults did not propagate in a simple piggy-back fashion but show evidence of a complex, synchronous sequence with events of
fault reactivation and out-of-sequence thrusting. |
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| Keywords: | Thrust Tectonics– sedimentation Cenozoic High Atlas Morocco |
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